Calculating-machine.



E. H. PALMER 6; W. S. KINSLEY. E. m. a n. v. PALMER a w. H. noasars, EXECUTORS or E. H. PALMER, DECD.

CALCULATING MACHINE. APPLICATION FILED AUG-2. 912. 1,212,248.

, a snsn-sucer l.

Patented m 16,1917.

v E. H. PALMER & W. S. KINSLEY. E. II. a a. v. PALMER & w. H. ROBERTS, EXECUTORS or E. n. PALMER, mic'n.

CALCULATING MACHINE.

APrucAr-ow FILED Ana-2. m2.

1,212,248; Patented Jan. 16,1917.

. J figZmen a a W312i E. H. PALMER & W! S. KINSLEY.

E. H. PALMER 62 W. S. KLNSLEY. E- I. I. v. ulna & w. a. nouns, EXECUTOIS or E. u. nuazn. usc'n.

MEMATING MACHINE. 1,212,248.

APPHCATIOII FILED'AUGIZI 1912. I

Patented Jan. 16, 1917.

8 SHEETS-$HEET 4- Hum: A

Q iiTi E. H. PALMER & W. S. KINSLEY. E- M. l H- V. PALMER 6L Vl- H. ROBERTS, EXECUTORS OF E. H. PALMER, DEC'D- cucumms momma. APPLICATION FILED AUG-2| 1912.

Patented Jan. 16, 1917.

8 SHEETS-SHEET 6.

H In

EDWARD mistrial. m) e f KINSLEY ASS G B 1'0 D lQLMEBt-EMILX M PA R. memento V4: rawm- TH or WA G AQHE $TTS,, AND.. WAL'1ER S F Q E F TFm 19 AW E W D. .1. .sxncu'ross assmnons TO EmmYymJALMEJs Aim.

. VIDUALLY.

To-all whom it may concern Be it knownthat we, Enwann H. PALMER andflViLLI M S. Klxsnny, citizens of the United States; and residents of Reading, in

the county of Middlcsex and State of Massachusetts, have invented certain new and useful Improvements in Calculating-Machines, ofwhich the following is a specification.

This invention relates to calculating apparatus. especially adapted for operation simultaneously with a typewriting machine under-the control'iif the latter, for indicating totals of figures which are being written on a sheet by a 'typewriting machine.

The 'p resentintention has particular reference to improvements upon the type of apparatus -shownin our application filed December 18, 1909, Serial No. 533,443.

The especial objects of the present invention, are to provide improved means whereby the calc ulatiiigfl,apparatus may be operated by power or other words to connect power up to the calcu atlng mechanism whenever a numeral key of the typewriting machine is actuated- It niayfbe stated here. however, that with wery slight changes the calculatinglmech-anismlmay be operated solely by power obtained through manual actuation I of the said numeral keys.

A further pbject is to provide means wherebythe operative combination between the typewriting machine and the calculating apparatus may be effected without mak- -Ing any positive connections between the A further objectof thepresent invention is to provide-1annimproved compound carriage for effecting the actuation of the reciprocati'ng, slideshvhich transmit motion to thecountersa A-further object is to provide an proved selector mechanism for connect ng thecounterthat-isto be actuated according to the position oflthe typewriter carriage,

with any numeral key that is to be used.

Afurther object is to provide means for preventing-any steip movement of the typewriter carriage until the actuation of the i counter has been completed.

A further object is to provide improved mechanism for intermittently connecting CALCULATING-MACHINE.

I Specificationof Letters Patent. P t t d J 1 1917. Application filed August 2, 1912.

Serial No. 712,872. a

' the typewriter carriage with the selecting mechanism.

Another object is to provide improved control mechanism relating to the connections for determining the actuation of a counter by the power mechanism when said power mechanism is permitted to operate by the movement of a typewriter numeral key ever.

A further object of the invention is to provide improved combination spindles for the counter i A further object is to provide a calculatmg mechanism with tabulating devices which are entirely separate from or independent of the typewriting machine, but which will locate on the sheet the columns of figures that are being written and added or subtracted.

Another object is to provide an improved carrying-resetting mechanism.

Further objects are to provide improvements which will be hereinafter described.

Of the accompanying drawings: Fi re 1 is a plan view of the right-hand portion of the calculating apparatus above which the typewriting machine is to be placed, the tabulating mechanism being omitted; Fig. 2 is a similar view of the left-hand portion of the apparatus. partly broken out; Figs. 1 and 2 together present a plan view of the complete apparatus; Fig. 3 is a front elevation of parts of the subtraction mechanism shown at the bottom of Fig. 2, on a larger scale; Fig. 4 is a View similar to a portion of Fig. 1. omitting some of the parts, but including the tabulating devices; Figs. 5 and 6 are detail sections on lines 55 and 6-6 of Fig. 4; Fig. 7 is a detail plan view of the resetting mechanism; Fig. 8 repre- 11 is a. bottom plan view of a. portion of Fig..

10; Fig. 12 is a detail elevation on line 12-1Qof Fig. 10; Fig. 13 is a detail elevation and'part section on line 13- 13 of Fig. 10; Fig. 14 is a detail section on line 1414 of Fig. 1; Fig. 15 is a detail plan view, partly in section, of portions of the counter actuating devices; Fig. 16 is a detail. plan view, partly broken out or in section, of one of the counter actuating rack bars; Fig. 17 is a. detail front elevation, partly broken out, or in section, of the counting mechanism; Fig. 18 is a detail elevation, partly broken out or in section, looking from the right in Fig. 17 Fig. 19 represents a detail section on line 19-19 ofFig. 1, a portion of a key lever of a typewriting machine being also shown; Fig. 20 represents a section on line 20-20 of Fig. 1; Fig. 21 represents a detail section on line 21-21 of Fig. 1; Figs. and .23 are detail elevations which together illustrate the resetting mechanism, Fig. 23 indicating a continuation of Fig. 22 to the right of the latter; Fig. 24 represents a section on line 2-'l24 of Fig. Figs. 15 to 24 inclusive are on an enlarged scale.

Similar reference characters indicate the same or similar parts in all of the views.

The embodiment of the invention illustrated in the drawings is designed for operation in connection with one of the standard models of typewriting machines, such as that known as the L. C. Smith. It is to be understood. however, that the invention is equally as well adaptable for use in connection with other typewriting machines. As the only connection between the typewriting machine and the calculating machine is thatwhich results from merely setting the former upon the latter, or in other words, providing the calculating machine as an understmcture or sub-base on which the frame of the typewriting machine is removably supported, it is deemed unnecessary to illustrate herein any ortion of a typewriting machipe further tian to show in Fig. 19 what the relative positions of the numeral levers of the typewriting machine would be relatively to the parts of the calcu lating machine. the actuation of which is controlled by said numeral key levers.

suitable base plate. which may be more or less skeleton for the sake of lightness, is indicated at 30. To avoid complexity of illustration the drawings indicate, such base as a solid or continuous plate.

The circular indicating disks of the machine are illustrated at 31 in Figs. 1 and 2. said disks being provided with numerals from one to naught, adapted to show successively through openings provided in a cover plate not shown, but which may be of the character illustrated and described in our application hereinbefore referred to. In some respects the mechanism for rotating the disks is similar to the structure of said application, but instead of rotating the disks by means of rack arms which during their first movement are out of actuating engagement with pinions, we now employ racks and pinions which are in constant mesh, with clutch devices to rotate the indicating disks intermittently in but one direction. As best shown in Figs. 16, 17 and 1 each indicating disk 31 is carricd by, so as to rotate with. a spindle 3:2 mounted to rotate on a fixed pin 33 rising from the base 30. The spindle 32 is provided with a vertically elongated ratchet pinion ll. The spindle and its ratchet pinion ill are supported upon a disk 35 having a spur pinion 36, said disk and. pinion being mounted to oscillate on the iixed pin 3?. oscillation be ing effected by means of an actuating bar having its front end formed with teeth to constitute a rack meshing with the spur pinion 36. By a mechanism presently dc scribed each actuating bar 37 is rcciprocatcil to a greater or less extent according to the amount that is to be added or subtracted. The disk 35 carries a pawl 38 held by means of a s] ring 3 in engagement with the lower end of the ratchet pinion 3-1. Suitable guides are provided to keep the rack ends of the bars 37 in engagement with the pinion 36. Each ratchet pinion 34 is engaged by a detent 40 suitably mounted as by means of a post 41, a spring 42 (Fig. 18) being cn1- ployed to preserve the engagement of the detent with the ratchet pinion to prcrent retrograde movement of the pinion and in-- dicating disk 31. To prevent over-motion of the ratchet pinion 34 and its indicating disk 31, we provide a lock mechanism comprising a light bar 43 pivoted at H to the actuating bar 37 and having a blunt tooth 45 and having its outer forward end beveled or inclined as at 46 adapted to co-act with a pin 47 supported by a part of the carrying mechanism hereinafter described. The lock bar -13 is held in its normal position by a light spring 48 secured at one end as by a screw 49 to one side of the bar 37 and having its free end extending upwardly. the tip 50 of saidfree end bearing against the side of the lock bar 43. To facilitate an understanding of the operation of. this portion of the machine it is to be understood that the actuating bars are normally inthe positions indicated in Figs. 15 and 16, that when a numeral key lever of the typewriter is depressed the selected actuat-mg bar is moved rearwardly or in the direction of the 'arrow in Fig. 16. and that when the actuating bar is returned by the power mechanism hereinafter described said actuating bar reassumes the position shown in Figs. 15 and 16 and stops at a point with the blunt tooth 45 en.- gaging the space between two teeth of the ratchet pinion 34, thus preventing over-m tion of the latter by momentum. As the ac tuating bar 37 moves in a direction the re verse of the arrow in Fig. 16 during the movement of actuating t e counting disk, the beveled end 46 of the lock bar .43 engages the pin 47 so as to hold said lock bar with its tooth 45 firmly engaging the ratchet pinion. When the next movement of said bar 37 occurs in the direction of the arrow in Fig. 16 said beveled end 46 leaves the pin 47 and the tooth 45 leaves the ratchet pinion, but the latter cannot rotate backwardly because of the detent 40. As shown in Fig. 18, the lock bar 43 is sustained at a suitable elevation above the bar 37 so as to engage the ratchet pinion 34 above the pawl 38, as by means of a block 51 interposed be tween said bars 37 and'43.

In order to carry tens from one indicator to the indicator next to the left of that in actuation, we .provide a series of short flat bars- 52 pivotally mounted upon posts 53 rising from the base 30. Each bar 52 carries at its left-hand end an arm 54 pivoted at 54, said arm 54 extending backward slightly beyond the ratchet pinion at the left, and said bar 52 carries at its right-hand end an arm 55 pivoted at 56 and-terminating a little short of the periphery of the ratchet inion at its right. Stop pins 58 set in the ase limit forward motion of the ends of bars 52 which carry the arms 54. The rear end of arm 54 is given the form of a ratchet tooth 54 positioned to enter the teeth of the ratchet pinion next adjacent to the left, While the arm 55 has a notch 60 cut from its rear end to engage a pin 59 fixed in the base plate. Both arms 54, 55 are caused to find their operative position by force of a spring 57 coiled around the post 53 and suitably engaged at its ends with said arms. Each vertical ratchet pinion 34 carries aflixed to its upper part a radially projecting tooth 63 so situated that once in each rotation of said pinion, this projecting tooth will contact with the pivotally mounted arm 55, rocking it out of connection with restraining pin 59 and permitting a spring 61, which is attached to the bar 52 at slight tension, to swing said bar and move the arm 54 a sufficient distance to rotate the ratchet pinion 34 adjacent at the left, with which it is engaged, one tooth, thereby carrying one ten to the indicator of next higher denomination. The rear ends of the springs 61 are suitably fastened to the base plate as at 62.

As indicated in Fig. 17, the pin 47 here inbefore described is a downwardly extending portion of the pivot pin 54. \Vhen the bar 52 is moved to carry onto the next indicator, the pin 47 is thrown forward and out of contact with the beveled tip 46 of lock bar 43, thereby instantly releasing the lock and permitting the ratchet pinion to be retated to bring the numeral of the next higher value to the view point. The right-hand edge of arm 54 is provided with a wedgeshaped projection or cam I mencing nearl opposite its single ratchet tooth and inclined toward the right in apsurface 54, com- 1 carrying, the cam surface 54 isj'ust out of position, ready for contactwith an abutment pin 54", but upon forward motion of the arm 54 to rotate a.

contacting .with' abutment 54'P--'deflects the ratchet pinion one tooth this cam edge 54 rear end of arm 54 toward its ratchet pinion,

thereby pressing the point of the ratchet tooth firmly against the pinion and locking it against any greater motion than the onetenth of a revolution desired.

To positively limit the extent to which the bars 37 may move forwardly We provide means such as stop pins 64 (Fig. 15) rising from the base. The actuating bars 87 reciprocate between, suitable front guides indicated at 65 in Fig. 18, and rear guides indicated at 66 in Fig. 19. Said two Figs. 18 and 19, although on slightly different scales, are to be referred to together to. in-

dlca'te nearly a complete sectionfrom front to rear of the machine. vided with an upwardly projecting pin 67, which is engaged by a mechanism present] described when said bar Each bar 37 is pro: i

y 90, is to be pushed'backwardly or in the direction of the arrow, Fig. 7

16. Each pin 67 is in the path of rearward movement of a slide 68 mounted in a casing 69 of the selector mechanism hereinafter described. Each slide 68 is formed or provided with U front and rear depending lugs 70 and 71 respectively for a purpose hereinafter described.

Before describing the means which determines which one of the slides 68 shall be selected for reciprocation, we will describe the compound carriage mechanism through,

which power is the selected slide and its counter actuating bar 37. Referring to Figs. 4 and 19, the compound carriage consists of upper and lower members 72, 73, slidably mounted in supports 74, each of said members having openings formed therein to reduce the weight thereof and to permit the passage through such opening of members of the resetting mechanism hereinafter described. The rear bar of the upper member 72 is formed or provided with a plurality of downwardly depending lugs 75 which are spaced uniformly in accordance with the lateral. spacing of the actuatingbars 37. The member 7:2 has a rearwardly projecting ledge 76 for a purpose hereinafter described, and at its transmitted to reciprocate ends is provided with outwardly projecting other words, to render it certain that bothi ends of said member will reciprocate inexact unison. The lower member 73 of the carriage has rearwardly extending arms 81, the rear ends of which arms have posts 82 connected by springs 83 with posts or lugs lesser number. Secured to the lower member 73 of the carriage 1s a .9 the ail, is

. ter normally in position to front of the machine,

ends of the hereinafter described.

depending from the upper member 72 of the carriage. The compound carriage is reciprocated by mechanism presently described, the construction of this carriage in two mrts' as mentioned enabling the lower mem r to travel always a-uniform distance while the upper member is so yieldingly con nected to it through the springs 83 as to enable said upper member to be stopped at a point of its rearward movement determined by the control mechanism hereinafter described, or in other words, according to the amount of movement that is to be imparted to an actuating bar 37 to count a greater or the upper face of strip of suitable light material, such as wood, having a strip of felt along its front face to serve as a buffer-when the two members of the carriage, after having been spread from their normal relationship are returned to the positions shown in Fig. 19. The

lower member 73 are provided with cars 86 which are connected by links 87 with arms 88 of a rock-shaft 89 mounted in bearings provided by the uprights 74, the, construction being such that whenever the rock-shaft 89 is actuated by the power jmechanis'm hereinafter described said rock-shaft acts through the links 87 to imp rt a single reciprocation to the lower mem r 73 of the compound carriage so that the latter, through the springs 83, imparts ayielding reciprocation to the upper member of the carriage. V

A bar 90, which for convenience of descri tion will be hereinafter referred to as carried by two arms or levers 91 92 ,to the member 72 of the carsaid arms 91 extending rearwardly i =aabove the ends of springs 93, which are attached to said member 72, the force of these springs bein exerted upwardly under the rear ends of the'arms 91 so as to yieldingly depress the bail 90 and hold the latcontact with the upper end of the pivot pin 44, the pin 44 therefore serving as an abutment for the bail 9 0. The object of the yielding support for the bail 90 isto enable it to be raised abovev the lane; of the tops of the abutments 44 uring the resetting to zero, as

It should be explained at this 'point that thefirst motion which an actuating bar 37 has 18 a rearward one, and this is effected by the rearward motion of the carria e, one of the lugs 7 5 contacting with the ront end of a slide 68, the rear end of the latter contacting with the pin 67 of the selected actuating bar 37, the return motion of saidfloar 37 toward the during which time roi ation is iumarted to the counter or indicatng disk, being effected by the bail 90 actmg upon the abutment 4.4, said bail being brought forward by the conn'mund carriage, which in turn has motion imparted. to it by the power mechanism reed to describe, referring particularly to Figs. 1 and .20.

A short shaft 94 is bearings, said shaft having a crank pin 95 projecting from a disk secured to the inner end thereof, said pin being connected by a link 95 to an arm 96 of rock-shaft 89. On the shaft 94 is mounted a clutch driving mechanism, which may be of the well-known type known as the Horton clutch, which is adapted to impart but a single rotation to the shaft on which it is mounted. Said clutch includes a pulley 97 for a belt constantly driven by any suitable power. Said clutch mechanism also includes a stop shoulder 98 which is engaged by a lug or hook at the end of a lever 99 pivoted at 100 and having a lug 101 on one side, the lever 99 being normally held upwardly by a spring 102. A pawl 103 has a shoulder 104 adapted to engage the lug 101 as presently described, and is formed with an inclined edge or cam surface 105, with which latter a fixed pin 106 co-acts, as presently described. A spring 107 connected to the pawl 103 and to a suitable fixed point acts to more or hold the pawl toward the right in Fig. 20. The pawl 103 is pivotally connected to an arm 108 of a rock-shaft 1.09 mounted at its ends in bearings provided in suitable upright portions of the frame, as seen bycomparin r Figs. 1 and 2, a coil spring 110 (Fig. 2% serving to normally hold the rock-shaft 109 in the position shown in Fig; 20, with a. rearwardly extending portion of the arm 108 in contact with a suitable stop 111. The rock-shaft 109 has secured thereto a series of arms 112, the outer ends of which are preferably bent at an angle to be engaged by the lower edges of the numeral keys lemounted in suitable vers of the typewriting machine so that v whenever a numeral key lever is depresse an arm 112 will be oscillated so as to rock the shaft 109, thus transmitting motion through arm 108 to pawl 103, depressing the latter so that its shoulder 104 will act upon the lug 101 of let-off lever 99 so that the latter will release the lug 98 of the clutch mechanism and permit the power to impart a single rotation to the shaft 94, the latter then imparting, through the link 95 and the shaft 89, a complete reciprocatory motion to the compound carriage. In Fig. 20 the shoulder 104 of the pawl 10 is not shown in position to engage lug 101. This is because in said figure we illustrate the operation of a device for holding the pawl 103 out of operative position. Before describing this mechanism we will explain that I will be stopped by the hook rod 119 of the selector 104 would be just when the pawl dedescribed, the first 99 as mentioned, the cam 105 ennormally the shoulder abovethe lug10l. Then ,scends in the manner just action is to depress lever but immediately thereafter gages pin 106 so that the pawl 103 is pushed to the left against the action of sprin 107 so as to instantly release lever 99 an pershown 1n Fig. 20 by its spring 102 to stop the clutch so that when the lug 98 of the clutch mechanism has made a single revolution in the direction of the arrow in said figure it of lever 99. In

Fig. 20 the device which is shown as holding the pawl 103 out of position to engage lug 101 comprises a spring retracted rod 113 passing through a bearing 114 and having its rear end connected to an arm 115 pivotally supported at 116 and having an 'anti friction roll 117 which is actuated by a cam 118 carried by the transverse reciprocating mechanism hereinafter described. This mechanism, as will be explained, provides for intermittent throwing of .the power mechanism out of con nection. It is sometimes desirable to permanently. disconnect the power mechanism, to enable the manually movable numeral key levers 131 (Fig. 19) presently described to be operated without causing the power mechanism to operate. For this purpose we provide a small rod 120 mounted in a hearing 121 and having a hooked end 122 passing behind the pawl 103. The front end of the rod 120 is connected to a finger lever 123 pivoted at 124 and having a spring 125 so connected as to exert friction that will hold the lever 123 in its outermost position toward the left in Fig. 20 to cause the hook 122 to retain. pawl 103 in the position shown in thatfigure against the action of spring 107, so that when depression of an arm 112 causes pawl 103 to descend, it will not engage lug 101 and be left inoperative. In Fig. 15 the dotted line representation of one of the bars 52 indicates the position to which that, bar is moved by the act of carrying from one counter to the other. It is essential, of course, that each of the oars shall be returned or reset to the full line position. Toeffect this resetting we provide the 'follovving mechamsm. leach pivot- 51" enters-an eye- 126 of a llllli lz'l Figs; 7,15,:uid- 19)-and each of the links 1.27is slotted at its rear end, as indicated at 128. the slots receiving pins129 rising from thestrip 8.1-. Since said strip 84. recipro ratesof course with the compound carriage, whenever tliecarriage approaches its rearvi ird position its pins 129, coacting with the rear ends oftl'ie slots 128 of links 127, will therefore the power will cause'tlie links to reset any or all of the for the lost motion connection provided by the slots 12s is that the extent of nio'venient of the reciprocating carriage is very much in excess of the amount of movement requlred to shift a bar'52 from the dotted line position shown in Fig. 15 to the normal or full line position. 1

11s has been mentioned, the apparatus is deslgned' to support. a ty ewriting machine without any positive mechanical connection. any suitable uprights connecte with the base 30. Two of the posts or uprights for supporting the frame of the typewritin carriage are indicated at 130 in 2. In practice two more suitable supports or posts will be provided nearer the front of the base. The four suppo'rts will in practice be relativel arranged to receive the usual four feet of a typewriting machine, The Said posts or supports are so positioned that when the type writing machine is placed thereon the numeral key levers willqccupy substantially the position V Fig. 19. A cross-bar 132 has connected thereto a series of spring arms 133, (Figs. 1 and 19) extending rearwardlyabove shaft 80 and out of contact therewithand under the front ends of the numeral key levers 131 so that Whenever a numeral keylevcr is depressed it will depress a spring arm 133.

It should be understood here. that immedi depress a spring arm shown 111 .131 in.

Such port may be afforded b means of gages one of the arms 112 of rock-shaft 109 (Fig. 20) so as to let the power impart a reciprocation. to the carriage as has been described. Each springarm'133 is 'provided with three holes through which three wires 131 (Figs. 1 upper ends of said wires. being hoolgednor bent above the arms 133, The lower ends of the three wires 134.:are pivotally connected to three stop levers 135, 136,137 pivoted upon a cI'OSSI'0Cl ;,138 .-'The three stop levers of each group difi'er frozneach other because one is foruse inadditiomiand the other two are used whensubtractiouis to be eifected, as hereinafter explained. The

and 19) pass loosely, the

difference between the three levers of each group is indicated by the notching thereof, shown in Fig. 19; that is, the lever-135 1s notched backwardly to a greater extent than the lever. 136, whilethe lever 13i'.:is:,not; notched at all.

This description 1 applies however to the group illustratedin 13 .49 designed for usein "connection,ARibhLSBh nine numeral "ke 1 Asexplained: thereinafter, there will each of the three groups. We will nQW. e-

scribe the mechanism which preventsthe lowering of but one of the stop leversrat, a time. p be shifted in the direction of its length-and Jo at difi'erent notchii-iigjn A crossbar 139 is mounted 75015218 to o upper has one end pivotally connected as at 140 (Fig. 2) to a lever 141 pivoted at 142 and actuated by mechanism which will be herelnafter described which provides an ad'ustment to determine whether the macliine shall be used for addition or subtraction. As shown in Fig. 19, the bar 139 has secured to its under side" a notched strip 143, the projections of which extend under the toes or tips of levers 135, 136, 137. The notches in the strip are of width to permit but one lever of each group of three to drop. When the machine is set for addition the cross-bar 139 and its notched strip 143 are in such a position that the notches will ermit only the levers 135 to be lowered.

hen a numeral key lever 131 is depressed it flexes the spring arm 133 that is underneath it so that the wire 134 which is connected to the stop lever 135 is permitted to descend, the end of spring arm 133 sliding down along the other two wires which are connected to the detained stop levers 136, 137. The uppermost positions of the stop levers is determined by a cross-stop bar 14-1, which ma have an under facing of suitable material such as a strip of leather or felt. The stop lever 135 which is freed descends by gravity until its extreme tip rests upon the surface at the rear edge of the upper member 72 of the carriage. As shown by the dotted line in F-igs19, the lever 135 is cut away or notched to a considerable extent. This is in order to permit the carriage mem ber 72 to move rearwardly to a distance so that when it is then returned forwardly it will actuate the counter disk for the column selected, to advance sufficiently to indicate the addition of nine, either on one disk or by carrying over to the next disk. It is to be understood at this point that the lever 135 which is to be permitted. to drop by the depression of another numeral key lever is cut away or notched backwardly to a lesser extent than indicated by the dotted lines in Fig. 19; for instance, if it is the stop lever which is lowered by the number one key lever the cutting away or recessing would he to a very slight extent. From this it will be understood that the stop levers mentioned determine the position to which the carriage member 72 can be moved rearwardly so that on the succeeding forward movement a the proper amount of counting or addition will be determined. The rearward end of the notching or cutting away of the stop levers 135 and 136 are undercut to allow the rear ledge 76 to prevent the stop levers from rising under the influence of the contact of the carriage member when it strikes the stop levers.

To prevent rebounding or forward movement of the upper carriage member 72 owing to the contact with the stop leversjust men tioned, we provide detent mechanism which is illustrated in Figs. 1 'and 21. Secureddo the carriage member 72 at substantially the.

middle thereof is a ratchet rack 145 with which a tooth 146 of an arm 147 co-acts, as presently described. The arm 147 is pivoted at 148 to a bracket 1-19 and is normally held in the position shown in Fig. 21 by a spring 150. The rear end 151 of the arm 147 extends upwardly to a position to be acted upon by a tappet 152 secured to rock-shaft 89 so that when the rock-shaft oscillates, as hereinbefore described, the said tappet 152, moving from the position shown by full lines in Fig. 21 to a position slightly below that indicated by dotted lines in said figure, will act to lift the tooth 146 from the ratchet rack 145. The outer end of the arm 147 is adapted to be engaged by a hook pawl 153m0un1'. ed to oscillate on rock-shaft 80, a spring 154 being connected to said shaft and hook pawl to swing said pawl in the direction of the arrow. The instant that the arm 147 is raised its outer end is engaged by the hook pawl and the tooth 146 is kept out of engagement with the ratchet rack until the rock-shaft 80 oscillates in a direction to cause a pin 155 of said shaft to engage a pin 156 projecting laterally from the pawl and swing the hook pawl toward the left in Fig. 21 so as to release the arm 147. leaving the latter then in position to engage any tooth of the ratchet rack when the latter is shifted rearwardly, or toward the right in Fig. 21. The timing of the operations of the tappet 152 and of the roclcshaft 80 is such that the arm 147 is raised at the instant when the compound carriage reaches its extreme position rearwardly, the pawl 153 releasing the arm 147 so as to permit the latter to descend when the carriage reaches its extreme forward position.

lt is essential, of course, that any of the slides 68 which may be accidentally moved in the direction of their length by any jarring action or friction of the cariage shall be accurately returned to proper position so that proper selection may take place. To effect this. the lower carriage member 73 is provided at its rear edge with an upwardly projecting rib 157 engaging behind the front lugs of the slides (38. Inasmuch as the carriage member 73 always reciprocates a fixed distance, its rib 157, although free to move away from the lugs 70 toward the right in Fig. 19, must, when the carriage returns toward the front of the machine or the left in F ig. 19, return all slides 68 that may have been shifted toward the right, back to normal position.

To prevent accidental longitudinal movement ofthe cross-bar 1.39 so as to shiftthe notched strip 143 unintentionally, we provide an automatic lock for said bar 139, as shown in Fig. 14. The bar 139 near one end has three recesses side by side,

as shown in Fig. 1, which are spaced in accordance with the spacing of the three stop levers 135, 136, 137 of a group. A lock arm 158 is pivotally connected to an arm 159 rigidly connected to shaft 109. The end of the lock arm 158 is beveled at 160 and rides upon a pin 161, said lock arm passing through. a guide 162 located and formed to prevent the lock arm from having any lateral. movement, although it may move vertically, as shown in full and dotted lines in Fig. 14. When the numeral key lever is depressed so that it engages an arm 112 (Fig. 20) and rocks the shaft 109, the lock arm 158 is drawn rearwardly, its inclined end riding down over the in 161 until the loweredge of said arm rops into a recess or notch of the bar 139, thus lockin the latter and reventing any accidenta shifting of it during the depression of a key. Of course if the bar 139 were to be shifted while a key was depressed then the stop lever which had been lowered would be liable to have its tip caught under the strip 143. This might then permit another stop lever of that group to drop through the notch.

\Vc will now describe the selector mechanism in detail, referrin to Figs. 1, 2, 4-, 7 and 19. The selector sli cs 68 are mounted, as has been explained, in a casing 69. Said casing is in two sections, each of which is movable intermittently and laterally, independently of theother To support these sections so that they may be shifted laterally of the machine we provide tracks or ways 163 (Fig. 19) mounted upon suitable supports such as posts 164 in order that space may be provided below the sectional casing for the actuating bars 37. Strips 165 underneath the sectional casing have end lugs projecting under the tracks 163 to prevent the casing from risin'gfthe said tracks, of course, also guiding the casing sections during their lateral adjustment by{ the mech anlsm-hereinafter described. ising from the base of the'machine at substantially the mid-width thereof is a post or bracket 166, the sections of the casing being at opposite sides thereof. The tWocasings are connected together by a spring 167 having a tendency to draw both sections toward the opposite sides of the post 166. A lever 168 p1voted'at169 has a roll 170 at its front end entering the space between the two sections of the casing 69 behind thefpost 166. This lever ig zictuated by a mfehl anllsm herein afte, seen so" a, ,c'o'n. 1 1e aes tig 3 1 I also; iiil a i s lisde es, indi ni i s; sessilergsigese se -slav "sears. ,one pf.;sa1d,s es ,a't a, tame can; be 0.6

se at r n gqt ns see ts? s r e se ra em s 'eill eTY i1e manda e r ea-li e a ra ge ea as agga-spas; 1e

c; spirin .;A f isga ae i seass;

- bla'se 50.11121 rel toward the left, the lever 168 is shifted step by step from the position shown in Fi 4 by means of. connections to be described. The first movement of thcro'll 170 toward the right will permit the spring 167to cause the left-hand casing section to move toward the right to bring one of the'slides 68 in position behind the first lu '75 at the left in Fig. 4 so that .the'r'earwar nir'ive ment of the compound carriage will cause the said first slide 68 atthe' 'i'eft to move rearwardly and. slide the ac' tuatingba'r 37 back to an exterft determined by thecontrol' mechanism hereinbefore described. A further movement of the lever 168will cause so a shifting along of the left-hand casing 69 to bring the next slide 68 in line with the next lug 75, and so on. The first series of stop movements of the lever 168 causes one traverse or sliding movement of the left hand casing 69 under the tension of spring 167 until the roll 170 of the lever contacts with the inner end of the right-hand casing section 69, further step movements of the lever 168 then inter nitten tlymoving said right-hand section;against the tension of spring 169, the left hanrl casing section coming to rest against'post 166,1 During this gradual step movement ofwthe casingsec tions all of the vernier-likeipositions,of; the 95 slides 68 have brought 'eacl1:one='ofi said slides successively into positioning act-as a temporary connection hetween the com pound carriage and an actiratingbar. 1317 5 i The reason for making thejselectorcasing in two sections is because -the, amountpf movement that would be required ifauade in one section or piece wouldcause the slidcs68 to be shifted along to such positions that two of the slides might bebrdught to con necting positions simultaneously unless the slides 68 and lugs 75 were macleu rohihitively thin or narrow. i p x The lever 168 which shiftstl ie sel'ector tions has a pin 171 at its,hear gndnvliihhfi engaged by mechanism a that is connected with carriage of, the ty 'iewritingfmach n a POItlOIY of the travel of car this latter purpose we pro ijj er shiftable frame comprisirrgf thef'biir mounted to travel between 11 peri and lower rolls 173 supported by brat ets y from the base30. Arms rigidly con 1 nectcd to the bar 119 andjextending rear- .1120 flly. the ef tn era 1,6 vhwh iigavis'fiirnveen a ine aii'cl lowe 561153177 time; by a r ck ;:uwisi s'; t it iabur'edtand ris1ng"f;rom-

{ 119i hir iipii 1161766125 o fof 'i'movement of erally or in dire To additionally anism which enga es the lever 168, the

'mounting of the said latch ,mechanism on the said plate enabling us to provide a 7 longer lever 168 than if such latch mech- 179 is, a rock-shaft1S9 anism were to be carried by the bar 119.

Referring particularl. to Figs? '10 and 11, the latter being an un er plan view of the plate 176. and the latch mechanism, :1. lug 181 is fixedly secured to the plate 176 in position to contact with the left side of the pin 171 of lever 168. Alatch 182 is pivoted to '183Eand has a cam surface 18-1 adapted to contact with a fixed, pin 185 rising from the base. The latch is normally held in the osition shown in Figs. 10 and 11 by a spring 186. The free end of the latch is formed with a shoulder 187 and with n vertical lug 188.

Mounted in therupper end or the upright I (Figs. 2,8 and 9) having a coupling inembercom rising an off-set arm 190 extending tangentially to the rock-shaft, the said arm -190,being beveled or inclined similar to -a latch, The shaft is formed with a key-way 191 which receives a pin projecting inwardly from a collar 192 having an arm 193, said collar being mounted in a slot or recess in the upright. The arm 193 is connected liy a link 194 with a lever 195 pivoted at 196 to the base of the upright. A spring 197 engaging the under side of the arm 193 normally holds the rockshaft and its latch or coupler arm 190 in normal position, such position being determined by a stop 198 projectin from the upright above the lever 195. aid leve'r 195 is formed with a cam surface 199 adaptedto engage a fixed in 200 projecting rearwardly from a side ange rising from the base (Fi s.-2 and 8'),

T e frame of the carriage of a typewriting machine always has some portion which is adapted to have the coupler or latch arm 190 engage therewith, whilean extreme end portion of the said typewriter carriage frame may contact'with the inner end of t e shaft 189 so that when the parts are coupled the upright will'partake of movements of. the'typewrit'er carriage frame in both (11- rections; In order that the distance'of the upri ht from'the typewriter carriage, when coup ed,may' be varied to enable numerals to be written in difierent lateral positions on the sheet of paper and at the same time'have the calculationoperations performed, the rock-shaft 189; may. be adjusted lpn itudinally. For this purpose said shaft is ormed with a series of annular grooves 201,e1thcr one of which may be engaged by. the end of a locking slide 202 havin a spring 203 actmg to hold said slide wit its u or end in one of said annular grooves.

rovided with a suite lefinger piece 204 to enable 1t tobe disengaged from the rockshaft to 'ermit the latter to be shiftedlongitudina y, the spring 203 then returning the lock slide tov co-act with another annular groove of said rock-shaft, This portion of the machine operates as follows: At the beginning of use of the machine the upright Wlll occupy the position shown in Figs. 4 and 8, which is its extreme rightehand position, the carriage of the typewriting machine, being separated from the coupler and occupying the position which it would have when beginning the writing of a line. The typewriting machine may be used for writing words, such as quantities and character of goods for which a bill is being made out, the parts being adjusted so'that when the portion of the bill sheet which is to have the amounts written thereupon has reached a proper position to be filled in, the left-hand end of the ty ewriter carriage frame rides over the beve ed surface of the cou ler, arm 190 and contacts with the end of s aft 189,

said arm 190 then springing up behind that portion of the frame of the typewriter carriage. To facilitate an understanding of this operation a portion of the frame, of the typewriter carriage which would be so engaged is indicated in cross section at a in Fig. 8. The spring which causes the typewriter carriage to travel then pushes the upright toward the left and of course causes the bar 119 and plate 176 to travel toward the left. At this time the shoulder 187 (Figs.10 and 11) is en aged with the righthand side of pin 171 o the lever 168 so that during step movements of the typewriter carriage and of the-upright 179, thelever 168 is caused to impart step movements to the selector mechanism already described. These step movements continue until the cam 184 reaches the fixed the latch 182 to swing an release the pin 171 of lever 168 so that the typewriter carriage can continue to move toward the left, if desired,.withoutproducing any further effect upon the selector mechanism. At the moment of separation of the latch from the selector lever 168 just described, the latter is in the position shown in Fig. 10. To hold it in this position until the typewriter carriage is shifted manuall to the right, we provide a detent mec anism illustrated chiefly in 'Figs. 8,- 10,12 and 13. A block 205 secured to the base 30-has an arm 206 pivoted to it at 207. The arm 206 has se- 7 cured to'it one end of a sprmg'detent 208',-

the free end of which curves upwardly, as shown in Fig. 12, t0 normally occupy a po sition in the path of movement of a small a slide is in 185, causing a has passed. a

stop. pin 209 extending downwardly from the lever 108. Thearm 206- also has secured to ita sprmg-arm210 having a In 211 at its free end,osaidi,lug having a have ed face with its spring detent and 212 Theiarm2OB s n'in'g arm is normally held in the position s iown in Fig. 10,. against stop pin 213, by a. spr1ng214a I i.

As the lever 168 is being shifted as here to fore described to: the position shown in Fig, 10, its stop pin-209 rides along the upvardly curvedcn'd of spring 208 and, den'esses the latte and snaps behind it to the aosition shown-imFig. 12, said spring 208 being strong enough to hold the lever 168 in that positionagainst the pull of spring 167 Fig. 4) therigh t' hand section of the selector casing beingthen of course held over to the right, the left-hand section of said casing being thenin contact withthe post 166. This is 'while'the typewriter carriage and the upright 179 are over to the left. When the typewriter carriage is returned toward the right'by the operator, the upright 179 is caused to follow that movement, and durin such following movement the cam 184 reac es the pin 185 so that the 'iatch 182 is momentaril swung aside on its pivot so as'to ermfit the lug 188 to take a position behin thd'side of lug 211. At this moment the cai'nfltii passes the pin 185 so that the spri g 1861of the latch will swing the latch ant c'aus'e its lug 188 to swing the spring arm J2i0gand with it swing its supporting bloclrfandthe spring detent 208 so that the tip oftliedatter is shifted away from its positio ngt'ofoppose movement of the leverl68. Wheuthe latch 182 returns to normal position ajs'j ist described, the shoulder 187 reengages the right-hand side of in 171. During urther movement of the typewriter carriageand the upright toward the right, the lug 181 of the latch, by its engagement with the pin 171 of lever 168, swings the latter soas to result in the selector casing sections being shifted back to the position shown in 4. The object of the inclined or beveled face 212 of the spring arm210 is to enable the lug 188, when passing from .the right; toward the left, to ride over said inclined face, depressing said spring arm in doing so, the latter then returning tonornial position after the lug 188 In .order tlmhthe; npright an l its. supporting carriage mayi be .held nga ts gestrcme right-hand without liability: of be ng wise displaced ,a fter the. typeugri tei marriage has left it. we profvideia detent comprisi a roll 215 carrimiby aliarn f 210.",pivoted to the base and helclab va sprmgQhZprnga notch or-keepera2I8 formed; in?

Quiz 115w It is desirable to positively prevent the p i i e h win-i= 1. a...

' "a red .01: .ot erp t o Eicli spiV- J J {otaily copnectedpneiid bka iig T5229 km isbtx aaar di 1 he wea a typewriter carriage from being stepped along during the time that calculating operations are being performed until the moment of the completion of each, calculating operation. To effect this we form or provide the bar 119 (Fig. 4) with a ratchet rack 219 with which a. pawl. 220 coacts. Said pawl s pressed toward the rack by a. spring 221. A link 222 connects said pawlwith' one of the arms 88 (Figs. 2 and 10) of shaft 89. The connection with the arm 881s by means of a pin engaging a slot in the link to permit of lost motion so that only during the latter portion of the motion of arm 88 toward the left in Fig. 19 will the pawl 220-- be disengaged from the ratchet rack. It will now be understood that since the'xarms 88 of rock-shaft 89 only reach the position shown in F ig. 19 at the completion of each calculating operation, as already" described, at all other positions of said arms 88 the pin 223 occupies a position in the slot of link 222 which permits the spring of pawl 220 to keep it in engagement with the ratchet rack 219. p

All of the locking bars or levers 52 which have been released and oscillated for carryin must be returned to their normal origina l position for resetting to zero. We will now proceed to describe the mechanism illustrated for obtaining this result, which is similar to the mechanism for the same purpose described in our application hereinbefore referred to. Mounted in side members of the frame is a shaft 224 having as many pins 225 projecting therefrom as there are bars 52 (Figs. 1, 15, 18 and 23). Each pin 225 is adapted to contact with the upper end of a pivot in or screw 56 So that when said shaft 224 is rocked all of its pins will engage the pivots 56 of those bars 52 which have been shifted out of normal position and oscillate said bars to positions so that the notches 60 of the arms 55 will engage the fixed pins 59 hereinbefore described, and lock all of the bars 52 in alinement in the positions shown in Fi 15. The mechanism for actuating the sha t 224 and its pin will be presently described.

we will now describe the mechanism whereby all the counters or indicators may be set to zero in order to prepare the machine for a new piece of work. Referring to Figs.-

at... toenail..- marinate by :1 lug 233 rising from a plate 234 which extends across the machine and is adapted to slide rearwardly and forwardly. In order that said plate shall reciprocate or slide as mentioned, its other end is' engaged with another arm or rock-shaft 231 similar to the arm 230. The plate 234 has as many downwardly projecting pins 235 as there are actuating bars 37, said pins 235 projecting down in front of lateral pins 236 of said actuating bars, the construction being such that whenever the primary resetting lever 227 is manually operated in a direction the reverse of the arrow in Fig. 22 all of the actuatin bars 37 are moved toward the left in said' gure. The actuating bars 37 co-act with slides 237 mounted in a casing 238,

. wardly' until the which latter is mounted to be shifted transversely of the machine in a manner similar to the selector casin 69, excepting that the casin 238 is a sing e one instead of a sectiona casin The right-hand end of the casing 238 is provided with a. cam surface 239 (Fig. 1), a spring 240, connected to the casin at 241 and at the other end to a suitable xedfpart of the frame, normally tending to shi t right. To shift said casing toward the left we mount a sliding strip 242 (Fi 22) on the base 30, said strip being guided y screws 243 passin through slots in the strip. The rear end 0 the strip 242 is beveled as at 244 (Fig. 1) and contacts with the cam surface 239 of casing 238, so that by sliding the strip 242 backwardly it will push the casing 238 toward the left, bringing the slides 237 into alinement with the rear ends of the actuating bars 37. Each slide 237 is normally projected forwardly by) a spring 245. To push the slide strip 242 ackwardly we provide a pawl 246 pivoted to the arm 228 and having a shoulder 247 and a beveled rear end 248 beyond which is a cam surfaced lug 249 rising from the base. When the pawl 246 moves toward the left in Fig. 22, the bev eled end 248 thereof rides over a lug 250 of the slide strip until the shoulder 247 of said pawl engages said lug 248, after which further movement of the pawl in the same direction will cause the slide strip to move rearbeveled end 248 reaches the cam lug 249 and to which the end of the pawl rides so as to disengage the shoulder 247 from the lug 250. The return or forward movement of the slide strip is eifected by a pawl 251, the free end of which is formed similar to the pawl 246 and co-acts with a cam lug and catch lug similar to those provided for said pawl 246 when said pawl 251 is moved toward the right in Fig. 22, which is a direction toward the front of the machine. The awl 251 is carried by an arm 252 (Fig. 22) which is mounted to rock on the shaft 226, said arm having a hub mounted in a side frame member 30 and havand hold said casing toward the ing a lever 253 secured to its outer end, which lever is referred to as a secondary resettin lever, the said secondaruresetting operated, said secondary lever is formed or provided with a rearwardly extending lug 254, which is adapted to be engaged and released by a lock rising from tho slide strip 242. When the slide strip is in its forward position the lock 25:") prevents the sec ondary lever from bein swung forwardly. The levers 227, 253, are ield normally in th positions shown in Fig. 22 by springs 2.36 connected to upwardly projecting portions of the arms which are swung by said levers.

Mounted loosely on a suitably supported stud shaft 257 (Figs. 1 and 23) is an arm having two triggers 259. 266, pivoted on opposite sides of its outer end. The tip of the trigger arm 260, upon its downward movement, acts upon the rear end of an am:

261 pro'ecting rearwardly from the shaft 224, sai shaft being held in the normal position shown in Fig. 23 by a suitable spring. which may be connected as described in the application hercinbefore referred to. When the trigger 260 descends, it rocks the shaft 224 to cause the pins 225 to act on the bars 52 in the manner hereinbefore described.

Also mounted loosely on the shaft 257 (Fig. 23) is an arm 262 which has a pin and slot connection 263 with the arm 261 so that when said arm 261 is depressed by the trigger 260, it depresses the arm 262 and raises a ratchet segment 264, which is rigidly connected with or forms a part of the arm 262. A pawl 265 is normally held by a spring in engagement with the teeth of the ratchet segment so as to hold the shaft 224 through the connections described, to prevent the return of said shaft and its ratchet lockin pins until the pawl 265 is released. To e feet this release the tail of said pawl projects into the nth of movement of a lug 267 of slide stri 242. 1

A shaft 268 ig. 23) has an arm 269 having a pin and slot connection 270 with mm 271 of a lever having a ratchet segment 272 with which a pawl 273 co-acts as presently described. The segment 272, in Fig. 23 is behind segment 264, and the two segments Inn are of the same length. The shaft 268 has 1 2% said arms 55 from being swung out of the 39 position shown in said Fig. 15. The pawl 273 (Fig. 23) is pivoted on the same a'vis as the pawl 265 and is pivotally connected at 275 to a long link 276, the rear end of which has a pin and slot connection with the arm 252, so that whenever the secondary resetting lever 253 is pulled forward to its extreme position, it withdraws the pawl 273 from its ratchet segment so as to allow the shaft 268 return to normal position under the influence of a suitably connected spring 'in a manner similar to the structure in the application hereinbefore referred to. hen the pawls 265 and 273 are released after 5 having been withdrawn from their ratchet segments they are returned to normal positions by suitable springs, such as indicated at277.

The arm 258, which carries the triggers 259, 260 has its hub provided with a clownwa'rdly' extending arm 278 (Fig. 23) to which is pivoted. the front end of a long link 279, the other or rear end of which has a pin and slot connection with the arm 228 of the primary resetting lever.

We will now describe the tabulating devices which enable the operator to quickly determine theposition of the typewriter carriage according to the first numeral that is to be written and tabulated. It may be stated here that with a machine organized as illustrated, the number of counters provide for adding up to within a cent of ten billions, the position for the carriage when 5 a numeral is to be written in the billion column being at the extreme left.

Referring to Fig. 4, the sliding selector rod 119 is provided with a suitable projection such as a collar 280, which collar is 0 adapted toabut against the side of the rear end of either one of a plurality of slides 281 as the said rod 119 moves toward the left,

the stoppage thus effected determining the position of the typewriter carriage. There 5 are twelve of the slides 281 mounted in a suitable frame indicated at 282 in Fig. 5. Each slide is provided at its forward end with a lug 283 which co-acts with the frame to form a stop to limit the rearward movement'of the slide. Each slide has at its front end atripping lug 284 to co-act with a tappet arm 285 depending from and secured 'to a rock-shaft 286. There are as many 'tappet arms 285 as there are slides 5 281. The rock-shaft 186 has secured to it a: rearwardly 'projectingtripping arm'287 f in position to operate the; usual: carriage release mechani'sm employed in 'typewrit-ing -nmrli'iries; having tabula-ting devices, such mechanism usually having a rock-shaft pmvirled witlrsan arm. lt is such; arm of 'the, usual I tabulating mechanism of the typewriting machine that is to i be lifted why the annwilfii illustrated H1 Fig. 5. 'Sueh arm of the iusual tabnlating mechanism of an ordinary typewriting machine is indicated at b in Fig. i

Extending transversely of the machine, as illustrated in Fig. 4, and above the slides 281, we provide a suitably mounted series. of rock-shafts 288, eaclrhawingan arm 289 forked at its lower end and engaging a pin 290 of a slide 281. Thereareas many rock, shafts 288 as there are ,slides 281. Eachrock-shaft 288 has also, :another arm 291 (Figs. 4 and 6), said arm 291 having pivot.- ally connected to its lower end the rear end of a push rod 292 extending nearly to the front of the machine and havingl a finger piece 293, a spring 294. being employed to hold the push rod normally forward. \Vhen the operator wishes to start the calculating with any particular counter, the proper fin ger-piece 293 is pushed inwardly so that, through the connections described, the proper slide 281 has its rear end projected into the path of movement of the collar or projection 280 of the rod 119. Incidentally, this movement, owing to the rock-shaft 2S6, arm 287 and the tabulator arm 1) shown in Fig. 5, would release the carriage of the typewriting machine and permit it to be stepped by its spring. It will be understood, however, that if no typewriting machine is present, the operation will be the same if it be desired to use the mechanism illlustrated for tabulatin'g. In such case, however, a suitable spring would be applfited to the rod 119 to shift it toward the le e will now describe the mechanism which enables the machine to ,be used for subtraction. As has been explained, there; is a lever 141 (Fig. 2) connected to a sliding cross-bar 139, which latter carries a notched strip 143, each notch freeing either one of the levers 135, 136, 137 (Figs. 1 and 19) to permit it to drop when released by the depression of the numeral key lever 13], the three levers of each group being dili'erently recessed to permit the compound carriage to move rearwardly to a greater or lesser extent. The mechanism for controlling the position of the lever 141 and bar' 13!! and its notched strip is. best illustrated in Figs. 2 and 3. The lever 11-1 normally held for addition in the position shown in Fig. 2, against a stop pin 29?. by a spring 295. The front end of the lever 141 is connected to a slide 297 by devices presently described. Theslide 1297 'is mounted in a suit.- able slideway transrerseof the machine near the frontthereof. and has aseries of notches 25min its upper cdge.al i$'otallv mounted. lmlow the slide 297 are ,upriglitstops 29;}, the: pivotal connections being .oia friction type that will hold said stops upright until they, are positively swung aside. {1 Each stop 299 has a pin 300 extending througlnth notches 298 of theslido and intotlie notches @{Olun fixed cross-bar 302 that the amount of swing that can be imparted tQthepivoted notches 301.

There is a well-known method of subtraction by means of addition, and it will not be necessary to herein refer to said method further than to state that it requires the addition. of a 1 to the right-hand column, the

prevention of carryin beyond the higher value enumerated, and the reversal of the order of the digits; for instance, if a (l is to be subtracted, 3 is added, and if a 5 is to subtracted 4 is added, and if a 9 is to be subtracted. there shall be an actuation of a. lever which will do 110 adding but which will actuate the mechanism to print a 9. This method provides for the addition of the complement of 0 (the difference between 9 and the real amount to be subtracted) and the prevention of carrying as stated, The operator can select either one of the pivoted stops 209 and throw it over toithe dotted line position indicated in Fig. 3, so that the lower end of said pivoted stop will. pass in front of the left-hand end of the bar 5:2 that. is at the right thereof, so that said bar .32 cannot be moved to the dotted line position indicated in Fig. 13. This, owing to the mechanism illustrated in said Fig. 15 and hereinbefore described, will prevent carrying beyond that'point. When the operator so swings a pivoted stop the pin 300 thereof shifts the slide 297, and through lever 141 shifts the bar 139 and its notched strip 113 (Figs. 2 and 19) so that the stop lever 135 of each group cannot be depressed, but instead thereof the stop levers 136 of all of the groups are free to be depressed when released by the manual operation of a numeral key lever 131. The stop levers 130 have the relative depths of their notches or recesses so arranged that the amount of movement that can be imparted to the compound carriage, instead of being according to the numeral borne by the numeral key lever, will be the complement of that numeral according to the method of subtraction by means of addition just described.

It should be explained here that when the operator shifts a pivoted stop 299 as just described, it is essential that the slide and the lever 141 and the bar 139 shall be locked against the action of spring 295 as long as subtraction is to be continued. To effect this, we provide the slide with a pin 303 (Fig. 3) which is adapted to be engaged by the shoulder 30-1 of a detent 305 pivoted at 300 and normally pressed upwardlvby a spring 307. In Fig. 3 the parts are in the relative positions which they occupy when addition is to be performed. lVhen subtraction is toibe effected by the method described. the pin 303 is moved to the left from the position shown in F1 g. 3, the spring 307 then throwing the detent 305 up so that v I its shoulder will engage and lock said pin. stops will be limited by the width of the We will now describe the object of providing the stop levers 137 of the grou s hereinbefore mentioned,-and the means or bringihg those stop "levers into operation in place of the levers 135, 136. As shown in Figs. 2 and 3, the front end of the lever 141 has pivoted thereto a finger-piece 308 having a downwardly projecting lug 309 adapted to bear upon the detent 305. The front end of the lever is forked, as at 310, to engage op 0- site sides of a lug 311 rojecting upwar 1y from the slide 297. Af t been shifted as hereinbefore described, to provide for subtraction by the complement of 9. the present mechanism provides for a further operation presently described, which requires a further shifting of the slide 297 toward the left in Fig. 3. \Vhen this is to be done the operator presses against the fingerpiece 308 toward the left in Fig. 3, so as to impart a further movement of the lever 141 in the direction of the arrow in Fig. 2 so as to shift the bar 139 and its notched strip 143 to free all of the stop levers 137 and permit any one of them, instead of the stop levers 13.). 136, to drop when a numeral key lever is depressed. As presently explained this is done only for the depression of one numeral key lever. The operator retains hold of the fingenpiece 308 until such numeral key lever has been operated. and then as soon as pressure against the finger-piece 308 is reduced, the spring295 returns the lever 141 so that the slide 297 will move toward the right again, while the lug 309 is still bearing upon the detent 305 with sufficient pressure to hold the latter down to permit the pin 303 to return to the position shown in Fig. 3.

As has been explained, the stop levers 135, 136 of the different groups are so recessed to permit movements of the compound carriage for operating the indicators according to the numerals of the numeral key levers when addition is to beefl'ected, but according to the complement of those numerals when subtraction is to be effected, the relationship being according to the complement of 9. The stop levers 137 of the groups are so recessed as to provide for the movement of the compound carriage according to the complement of 10 instead of the complement of 9. For instance, if the numeral. key 3 were to be depressed and a stop lever 137 free to descend.

the amount that would be added would'be 7 instead of 3, and if a numeral key 6 were to be depressed the amount of addition would be 1 instead of 0. ith this explanation it will be understood that when the finger-piece 308 is operated so as to act through the lever 141 to shift the bar 139 and its notched strip to free all of the stop levers 137, then the depression of any numeral key will result in the addition of a number the complement of er the slide 297 has i 

